Tub enclosure



FIG. 1 is a front perspective view of the tub enclosure showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a side view thereof.

The broken lines showing of the tub is for illustrative purposes only and forms no part of the claimed design. 

An ornamental design for a tub enclosure, as shown and described. 